Security advisory

{
  "id": "8b05f8bd7bfe9d52a26f44988bcd742ebdb91cce71f50d7e761c22d8757f4a1e",
  "url": "https://osv.dev/vulnerability/CVE-2017-20290",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2017-20290",
    "summary": "Discourse 1.9.0.beta2 before 1.9.0.beta13 contains a reflected cross-site scripting vulnerability that allows unauthenticated attackers to inject scripts through the email parameter of /email/unsubscribed. Attackers can craft GET requests with SVG onload payloads, which unsubscribed.html.erb renders unescaped via html_safe, executing JavaScript in victims' browsers. Exploitation evidence was first observed by the Shadowserver Foundation on 2023-10-19.",
    "evidence": "osv:CVE-2017-20290",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2017-20290",
      "aliases": [
        "CVE-2017-20290"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/discourse/discourse",
              "type": "GIT",
              "events": [
                {
                  "introduced": "eaeae0ac3101b43297a7bb3cab58b66b74bb2714"
                },
                {
                  "fixed": "6f923d5964519372262576893835cf4ebb26e73e"
                },
                {
                  "fixed": "6e37f09b19"
                },
                {
                  "fixed": "a6f2533d38"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "1.9.0.beta2"
                      },
                      {
                        "fixed": "1.9.0.beta13"
                      }
                    ],
                    "source": "DESCRIPTION"
                  },
                  {
                    "range": [
                      {
                        "fixed": "6e37f09b19"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "a6f2533d38"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.9.0.beta12",
            "v1.9.0.beta11",
            "v1.9.0.beta10",
            "v1.9.0.beta9",
            "v1.9.0.beta8",
            "v1.9.0.beta7",
            "v1.9.0.beta6",
            "v1.9.0.beta5",
            "v1.9.0.beta4",
            "v1.9.0.beta3",
            "v1.9.0.beta2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-20290.json"
          }
        }
      ],
      "modified": "2026-10-24T02:45:18.004000577Z",
      "provider": "osv",
      "references": [
        "https://github.com/projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/other/discourse-xss.yaml",
        "https://www.vulncheck.com/advisories/discourse-1.9.0-beta13-reflected-xss-via-email-unsubscribed",
        "https://github.com/discourse/discourse/commit/6e37f09b19",
        "https://github.com/discourse/discourse/commit/a6f2533d38"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2017-20290",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 428163,
  "published_at": "2026-10-22T11:17:03.22+00:00"
}